Helmet locking mechanism



FIG. 1 is a left side elevational view of a helmet locking mechanism showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left perspective view thereof, with the lock unfastened;

FIG. 8 is an another left perspective view thereof; and,

FIG. 9 is a perspective view thereof, shown in the environmental use.

The broken lines environment is for illustrative purpose only and forms no part of the claimed design. 

CLAIM The ornamental design for a helmet locking mechanism, as shown and described. 